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In-Depth Genetic Diversity and Population Structure of Endangered Peruvian Amazon Rosewood Germplasm Using Genotyping by Sequencing (GBS) Technology

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In-Depth Genetic Diversity and Population Structure of Endangered Peruvian Amazon Rosewood Germplasm Using Genotyping by Sequencing (GBS) Technology Article In-Depth Genetic Diversity and Population Structure of Endangered Peruvian Amazon Rosewood Germplasm Using Genotyping by Sequencing (GBS) Technology Muhammad Azhar Nadeem 1,† , Stalin Juan Vasquez Guizado 2,† , Muhammad Qasim Shahid 3 , Muhammad Amjad Nawaz 4 , Ephrem Habyarimana 5 , Sezai Erci¸sli 6 , Fawad Ali 7, Tolga Karaköy 1, Muhammad Aasim 1, Rü¸stüHatipo˘glu 8, Juan Carlos Castro Gómez 2 , Jorge Luis Marapara del Aguila 2, Pedro Marcelino Adrianzén Julca 2, Esperanza Torres Canales 2 , Seung Hwan Yang 9 , Gyuhwa Chung 9,* and Faheem Shehzad Baloch 1,* 1 Faculty of Agricultural Sciences and Technologies, Sivas University of Science and Technology, Sivas 58140, Turkey; [email protected] (M.A.N.); [email protected] (T.K.); [email protected] (M.A.) 2 Specialized Unit of Biotechnology, Research Center of Natural Resources of the Amazon, National University of the Peruvian Amazon, Iquitos 1600, Peru; [email protected] (S.J.V.G.); [email protected] (J.C.C.G.); [email protected] (J.L.M.d.A.); [email protected] (P.M.A.J.); [email protected] (E.T.C.) 3 State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bio Resources, South China Agricultural University, Guangzhou 510642, China; [email protected] 4 Laboratory of Bio-Economics and Biotechnology, Department of Bio-Economics and Food Safety, School of Economics and Management, Far Eastern Federal University, 690950 Vladivostok, Russia; Citation: Nadeem, M.A.; [email protected] 5 Guizado, S.J.V.; Shahid, M.Q.; CREA Research Center for Cereal and Industrial Crops, 40128 Bologna, Italy; [email protected] Nawaz, M.A.; Habyarimana, E.; 6 Department of Horticulture, Faculty of Agriculture, Ataturk University, Erzurum 25240, Turkey; Erci¸sli,S.; Ali, F.; Karaköy, T.; [email protected] Aasim, M.; Hatipo˘glu,R.; et al. 7 Department of Plant Sciences, Quaid-I-Azam University, Islamabad 45710, Pakistan; [email protected] In-Depth Genetic Diversity and 8 Department of Field Crops, Faculty of Agricultural, University of Cukurova, Adana 01380, Turkey; Population Structure of Endangered [email protected] Peruvian Amazon Rosewood 9 Department of Biotechnology, Chonnam National University, Chonnam 59626, Korea; Germplasm Using Genotyping by [email protected] Sequencing (GBS) Technology. Forests * Correspondence: [email protected] (G.C.); [email protected] (F.S.B.); 2021, 12, 197. https://doi.org/ Tel.: +90-545-540-4239 (F.S.B.) 10.3390/f12020197 † These authors contributed equally to this work. Received: 13 October 2020 Abstract: Research studies on conservative genetics of endangered plants are very important to Accepted: 2 February 2021 establish the management plans for the conservation of biodiversity. Rosewood is an evergreen tree Published: 8 February 2021 of the Amazon region and its essential oil has great acceptance in the medical and cosmetic industry. The present study aimed to explore the genetic diversity and population structure of 90 rosewood Publisher’s Note: MDPI stays neutral accessions collected from eight localities of Peruvian Amazon territory through DArTseq markers. with regard to jurisdictional claims in A total of 7485 informative markers resulted from genotyping by sequencing (GBS) analysis were published maps and institutional affil- used for the molecular characterization of rosewood germplasm. Mean values of various calculated iations. diversity parameters like observed number of alleles (1.962), the effective number of alleles (1.669), unbiased expected heterozygosity (0.411), and percent polymorphism (93.51%) over the entire germplasm showed the existence of a good level of genetic variations. Our results showed that the Mairiricay population was more diverse compared to the rest of the populations. Tamshiyacu-2 Copyright: © 2021 by the authors. and Mairiricay-15 accessions were found genetically distinct accessions. The analysis of molecular Licensee MDPI, Basel, Switzerland. variance (AMOVA) reflected maximum variations (75%) are due to differences within populations. This article is an open access article The implemented clustering algorithms, i.e., STRUCTURE, neighbor-joining analysis and principal distributed under the terms and coordinate analysis (PCoA) separated the studied germplasm on the basis of their geographical conditions of the Creative Commons locations. Diversity indices for STRUCTURE-based populations showed that subpopulation A is more Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ diverse population than the rest of the populations, for such reason, individuals belonging to this 4.0/). subpopulation should be used for reintroduction or reinforcement plans of rosewood conservation. Forests 2021, 12, 197. https://doi.org/10.3390/f12020197 https://www.mdpi.com/journal/forests Forests 2021, 12, 197 2 of 17 We envisage that molecular characterization of Peruvian rosewood germplasm with DArTseq markers will provide a platform for the conservation, management and restoration of endangered rosewood in upcoming years. Keywords: Aniba rosaeodora; DArTseq; germplasm characterization; molecular markers; popula- tion genetics 1. Introduction The world’s flora and fauna are currently facing a huge loss of habitat which has reulted in the depletion of a number of populations, some leading to extinction [1]. The conservation of plant species has not received the required attention as compared to animals [2]. According to the information shared by the first global analysis of extinction risk in 2010, 25% of the world’s plant species are critically endangered [3]. Endangered species are known to have small or declining populations that experience the effects of inbreeding and genetic erosion resulting in high extinction risks [4]. The conservation genetic studies are considered vital for the preservation perspective of en- dangered species [5]. Previous research efforts have confirmed that both anthropogenic activities and climatic changes are becoming stronger than before, and are resulting in habi- tat fragmentation and/or population decline for a good number of endangered species [6,7]. By realizing these threats, it is very important to investigate the adaptive potential, genetic diversity and long-term conservation status of endangered plant species [8]. The Amazon region is considered one of the “richest reservoirs of biodiversity” and “most-varied biological reservoir”, containing several million species of insects, plants, birds [9]. Rosewood (Aniba rosaeodora Ducke) belongs to the family Lauraceae with diploid chromosomes number 2n = 24. Rosewood forests are present in Peru, Brazil, Colombia, Guyana, Venezuela and Suriname [10]. Indigenous peoples of the Amazon basin mostly used the rosewood to make canoes and as fuel. Rosewood essential oil is very popular, because it contains high contents of linalool. It is reported that 74.4–81.8% linalool content is present in leaves and branches of rosewood, while trunk wood contains ~100% linalool content [11]. From 1875 to 1975, extraction of essential oil was carried at the commercial scale which resulted in the significant depletion of natural rosewood stands [12]. After the depletion of rosewood natural stands, French Guiana prohibited the cutting of trees which resulted in a significant decrease in the export of essential oil. Presently, Brazil is the only producer and exporter of its essential oil [13]. Cutting of rosewood trees on large scale resulted in the complete depletion of rosewood forests from various regions of the Amazon. Currently, rosewood is included as an endangered species in the database of the Convention on International Trade in Endangered Species of Wild Fauna and Flora [14]. The variations in climate, altitude, latitude, soils and typography together make Peru home to a spectacular diversity of flora and fauna [15]. The north Marañon–Amazonas river axis, along the rivers Tiger, Napo and Putumayo in Peru, contains the rosewood stands [16]. Samuel Reggeroni, the owner of the Pucabarranca farm on the Napo River, started the rosewood trade very first time in Peru in 1941 by sending rosewood essential oil samples to Europe [16]. A rapid increase in rosewood essential oil trade was observed in Peru and other parts of the world in the 1950s, which resulted in fragmentation of habitats and deforestation resulting from the extraction of species of high timber value [14]. As a result of the fragmentation of habitats and deforestation, rosewood is now a vulnerable species in Peru [14]. To combat these issues, the Peruvian government has taken strong actions and the export of rosewood wood and its essential oil has been banned since 1972. Moreover, the establishment of rosewood plantations is suggested by the Peruvian Ministry of Agriculture in order to conserve this valuable species [14,16]. Germplasm characterization remains a fundamental and most important step in germplasm resource management and conservation and provides an opportunity to in- Forests 2021, 12, 197 3 of 17 vestigate the novel variations that can be helpful for the breeding perspective [17,18]. Assessment of genetic variation is considered a prerequisite to explore the genetic potential and efficient utilization of germplasm, and provides an opportunity to develop conser- vation approaches for the breeding of endangered species [19]. Investigation of genetic diversity within and among populations of endangered species facilitates the management and conservation of genetic resources, which
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